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SEF327R
Component Description
NFEC1169
The heated oxygen sensor 2, after three way catalyst, monitors the
oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates
voltage from approximately 1V in richer conditions to 0V in leaner
conditions.
Under normal conditions the heated oxygen sensor 2 is not used
for engine control operation.
CONSULT-II Reference Value in Data Monitor
Mode
NFEC1170
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
I Engine: After warming up
Revving engine from idle up to
2,000 rpm
0 - 0.3V +, Approx. 0.6 - 1.0V
HO2S2 MNTR
(B1)
HO2S2 MNTR
(B2)
LEAN +, RICH
SEF303UD
On Board Diagnosis Logic
NFEC1172
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the heated oxygen sensor 1. The oxy-
gen storage capacity before the three way catalyst causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sen-
sor is sufficiently high during the various driving condition such as
fuel-cut.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P1147
1147
(Bank 1)
P1167
1167
(Bank 2)
Heated oxygen sen-
sor 2 maximum volt-
age monitoring
The maximum voltage from the sensor is not
reached to the specified voltage.
I Harness or connectors
(The sensor circuit is open or
shorted.)
I Heated oxygen sensor 2
I Fuel pressure
I Injectors
I Intake air leaks
DTC P1147, P1167 HO2S2
Component Description
EC-516
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